Viscosimeter



Patented Dec. 8, 1925.

PIERRE JOSEPHTHOMAS, "F MONTBOUGE, FRANCE, ASSIGNOR TO COMPAGNIE POUR LA. FABRICATION nus oomrrnuns ET rnancn.

MATERIEL nusmns A esz, or monrnoue'n,

VISGOSIME'I'ER.

Application filed February 13, 1924. Serial No. 692,573.

To all whom it may concern:

-Be it known that I, PIERRE JosEPH THOMAS, citizen of the Republic of France, residin at 10 Place des Etats-Unis, Montrouge, cine,-France,l1ave invented new and useful Improvements in Viscosimeters, of which the following is a specification.

The present invention relates to an apparatus for determining the viscosity of a liquid by the braking action exerted b said liquid upon a solid body moving t erein under the action of an electric motor.

A form of realization of the present invention is shown, by way of example, in

w the accompanying drawing, in elevation and partly in section.

The apparatus consists essentially:

' 1. Of an electric motor constituted by an armature A, shunt-connected to a resistance B, through which there passes the current from an accumulator or battery 0, said armature being arranged in the field of a permanent magnet D. a

2. Of a removable rigid bell E, mounted it upon ,the shaft of the motor and immersed in an annular bath F which isalso removable. This bath is intended to receive the liquid whose viscosity is to be determined and is provided with an overflow G, and is fixed upon the frame of the motor.

A graduated dial H, in front of which there moves a pointer driven. by the shaft of the motor by means of a set of gearwheels, permits of measurin by means of at a chronometer, the time during which the bell efiects a predetermined number of revolutions.

For a given difference of potential at the terminals of the armature, the bell re- 4% volves more quickly in proportion as the liquid is more flui When it is desired to ascertain the manner in which the viscosity varies with the tern erature, the bath, filled with liquid, and

at the ell,- are placed in an enclosure having a known temperature, which is either higher or lower than the temperature of the atmosphere, whereupon the whole is placed'u on the motor, the bath and the bell being to adapted to assume their definitive positions rapidly and with facilitfziy; a thermometer is then placed in the over ow of, the bath, the motor is started and records are taken duri the cooling or heating of the liquid.

motor an With a view to varying the temperature of the liquid under examination, any other suitable means can be employed, such as a heating resistance, a heating or refrigerating coil, a movable bath adapted to cover the upperportion of the apparatus, or pre- 00 determined calorific radiations and the like.

It is evident that the bell may be of any suitable form, that the dial may be replaced by a tachometer, it is also possible to estimate, with the aid of a milliam eremeter the variations in the intensity 0 the current circulating in the armature which correspond to the variations in s' eed.

A height-regulating device not shown in the drawing) is rovided for the bath, which enables the su merged portion of the bell to be varied, with a view to regulatingthe apparatus.

1 claim:

1. apparatus for measuring the viscosity of a liquid comprising in combination a-tank to contain the 11 uid to be tested, a bell depending into sai tank and havin its lower end adapted to be immerse in said liquid, a motor for rotating said bell at a s eed governed by the degree of resistance 0 ered by the fluid in said tank to the rotation of said bell, said bath being removably mounted on the frame of said motor and means for indicating the 35 speed of rotation of said bell.

2. An apparatus for measuring the viscosity of a liquid comprising in combination a tank to contain the li uid to be tested, a bell depending into sai tank and no havin its lower end adapted to be immersed in said liquid, a motor adapted to rotate said bell ata s eed governed by the degree of resistance ohered by the fluid in said tank to the rotation of said; bell, said 5 bell beingi detachably connected to, said meanstor indicating the speed of rotation of said bell.

paratus for measuring the viscosity 0 liquids comprisin in combimy nation a tank to contain theuid to be tested, a bell depending into sai tank and havin its lower end adapted to be immerse in said li 'uid, a source of electric current, an; electric motor shunt-connected to said source of current and ada ted to rotate said bell, and means for in "eating the speed of rotation of said bell.

4. An apparatus for measuring the source of current and adapted to rotate said viscosity 0 liquids comprising in combibell,- a permanent magnet enclosing in its nation a. tank to contain the liquid to be field the armature of said motor, and means 10 tested, a bell depending into said tank and for indicating the speed of rotation of said 5 having its lower end adapted to be imbell.

merse in said liquid, a source of electric current, a. motor shunt-connected to said PIERRE JOSEPH THOMAS. 

